SOMETHING wrong, so fedup w/ it. HELP!

OK, i just got myself a KICK ass system, well here is the CONFIGURATION. but i can't seem to pin-point the problem.

ABIT KT7A-raid, TB 1.2 (still trying to figure out the STABLE LIMit of the CHIP, I think is 1.35)
OCZ PC150 256ram
visiontek GEFORCE ULTRA
IBM 7k HD
Pioneer slot 16xdvd
SB live
3com Ethernet


I'm thinking it's the geforce.
ONE major issue is that I'm still trying to find the MAX stable speed i can get from this CPU. as of right now, i have tried 150FSB, 145FSB, 140FSB, 4x AGP. and sometime i would get CRASH sometime i won't, I'M not excatly sure if it's CPU or the ULTRA, or other stuff.(sometime it happen when i play game, sometime it doesn't. THIS would be a CPU problem, but I set it at 1.2(8x150, 9x133,...) I'm still getting sometime crash sometime don't.), too much FSB maybe, feeding to the 4x AGP. then i tried 2x agp, seem to be OK. NOW it's 4x and it ok too. I'm so LOSST and confuse.

ANYONE got experience in running their GF2 at FSB over 145-150???? running at WHAT agp setting, 2x or 4x? anyone have any experience with any of my product, with FSB set that high???? in SANDRA, I CHECK the CURRENT AGP bus(4x)= <384mhz for 150FSB>. and <376mhz for 140FSB>, and <352 for 133/33fsb>.

another thing is that after OC the ULTRA, i'm getting the very close 3dmark scores. THE thing is I have already DL, Geforce Tweak Utility, and got the OC thing to show up on the VIDEO Property. but when ever i change and TEST and OK. then i tried 3dmark2000, i still get the same score.

1. do i need to reboot, before change take place....
2. i don't know, you help me out.......... I'm so sick of testing and reseting, damnnn this is a pain.